On Mon, 24 May 2004, Paul Y. Peng wrote: > Prof Brian Ripley wrote: > > First, there are no versions 1.7, 1.8 and 1.9. > > Sorry for my misuse of the version numbers. > > > Was your version of R compiled against MSVC++ 6.0? The binary on CRAN was > > not, and binaries for different versions of R were compiled with different > > versions of MinGW. The entry point isnan is part of the statically linked > > runtime on modern MinGW. > > I used the binary on CRAN.
Then please use the compilers described in readme.packages which match it. > > MSVC++ 6.0 does supply _isnan (as it really should as it is part of the > > C99 ISO standard), and you need to link against it appropriately. Hint: > > it may have an extra underline, since it seems it is known to C as _isnan. > > You may need to add > > > > #undef ISNAN > > #define ISNAN(x) _isnan(x) > > Many thanks for this suggestion. It works, as always. The extra > underline is required. > > > We don't support adding extensions to R using a different compiler to the > > one used to build R. Changes already made for future releases of R will > > make this less likely to work in R 2.0.x. > > I wish that the R API entry points documented in "Writing R Extensions" > be supported in the future versions of R, because it will make programs > built with R more portable than directly using compiler-specific > functions, such as testing and generating the IEEE 754 special values. > The existing entry points have saved me trouble to chase these values > whenever I moved to an environment with a different compiler. Who said they would not supported? What I said is that using a different compilers to compile different parts of R is not supported (and never has been). And that is even less likely to work in future releases. All we guarantee is that ISNAN and R_FINITE produce calls to functions that work under the system used to configure R. As on Windows R_FINITE now produces a call to a MinGW macro, that is not going to work under VC++ 6. We are not talking about using `compiler-specific functions' here, like _isnan. What R core is doing is using *standard* C99 functions where available, and a problem with VC++ 6.0 is that it is far from compliant with IEC60559 aka IEEE754. Given that the recommended compiler is freely available, it is unreasonable to expect any support for less capable compilers. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
